氢是已知的最轻的元素。Hydrogen is the lightest element________.?

A DC servo-motor is a type of ( ) applied to automatic control systems A: actuator B: amplifying element C: correcting element D: measuring element

If A is a matrix, the function max(A(:)) is ( ). A: to return the first element B: to return the maximum element in each row of the matrix C: to return the maximum element in each column of the matrix D: to return the largest element of the entire matrix

CSS中让元素隐藏，但是不清除元素的方法是（ ） A: element { display: none; } B: element { display: block;} C: element { visibility: visible; } D: element { visibility: hidden; }

In a singly linked list which operation depends on the length of the list.( ) A: Interchange the first two elements of the list B: Delete the first element of the list C: Add an element before the first element of the list D: Delete the last element of the list

two-terminal element

The quality element is ______ .

element distance

You<br/>are given pointers to first and last nodes of a singly linked list,<br/>which of the following operations are dependent on the length of the<br/>linked list? () A: Delete<br/>the first element B: Insert<br/>a new element as a first element C: Delete<br/>the last element of the list D: Add<br/>a new element at the end of the list

必需元素(essential element)